Can you post the code for your renderer? How many bytes total for 150 images at this lower resolution? Can you pre-compute the total set of images?
Thanks, -Alex ________________________________________ From: Gabriele Campi [[email protected]] Sent: Monday, June 30, 2014 9:34 AM To: [email protected] Subject: Re: list of images: poor performances Hi Alex, I've created a 150x80 version of my images but performances are almost the same (at least on Android) Gabri Il 30/06/14 17:19, Alex Harui ha scritto: > Hi Gabriele, > > You say your renderer is 150x80, yet the source images are 400x400 and up to > 100KB. > > Image loading is asynchronous, but bitmap rendering is not. If a 400x400 > image has to be shrunk to 150x80, that will take a lot of CPU power. It > would be better to have the images re-sampled before downloading. There will > be less data and the bitmap renderer will not have to shrink images. As a > test, chop a bunch of images to the right size and see if it performs better. > > -Alex > ________________________________________ > From: Gabriele Campi [[email protected]] > Sent: Monday, June 30, 2014 8:11 AM > To: [email protected] > Subject: Re: list of images: poor performances > > My custom ItemRenderer is 150x80 > I display 18 items at the same time > Using an IconItemRenderer doesn't help > > > *GABRIELE CAMPI* > Graphical Department > > > Il 30/06/14 17:09, Gabriele Campi ha scritto: >> 150 images >> Size 10 to 100 KB >> 400x400 pixel >> >> On iPad retina is almost ok. On iPad2/Mini is slow. On Android (galaxy >> tab 2) the list is unusable. >> Every new row of the list seems to freeze the ui while images are loading. >> I don't understand, Isn't the load process of the images asynchronous? >> >> Gabri >> >> >> >> Il 30/06/14 16:49, Alex Harui ha scritto: >>> How many images are we talking about? What pixel dimensions are the images >>> in the list? What are some of the sizes in bytes of the images being >>> downloaded? >>> >>> -Alex >>> ________________________________________ >>> From: Gabriele Campi [[email protected]] >>> Sent: Monday, June 30, 2014 6:30 AM >>> To: Javier Guerrero García; users >>> Subject: Re: list of images: poor performances >>> >>> Nothing seems to work... performances are even worse with a timer or delay >>> I cannot cache all the images because of memory consumption >>> >>> Il 28/06/14 10:44, Javier Guerrero García ha scritto: >>>> Also adjust the opaqueBackground, don't set the image sources >>>> inmediately but after a short timeout (so if you scroll down fast >>>> skipping lets say 50 images you DON'T load 50 images before loading >>>> the 51st), and use a contentCache loader with queueing >>>> (http://corlan.org/2011/08/16/flex-mobile-development-caching-images-using-contentcache/) >>>> >>>> >>>> P.S. you can use the ContentCache straight from MXML, not like the >>>> sources in the link. Just declare it, set an ID and the rest of the >>>> parameters, and set contentCache="{id}" in your itemRenderer. >>>> >>>> >>>> On Sat, Jun 28, 2014 at 6:58 AM, Alex Harui <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> Make sure you are using a bitmap cache and that the images are not >>>> being scaled down on the device. >>>> Sent via the PANTECH Discover, an AT&T 4G LTE smartphone. >>>> >>>> Gabriele Campi <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> >>>> Hi, >>>> in a mobile app I need to display a list of 200 images. On the list I >>>> use a tileLayout with virtualLayout=true and a custom itemRenderer >>>> that >>>> only contains a Spark Image. On the set value method of the >>>> itemrenderer >>>> I change the source of the image with the path to the new bitmap. >>>> It works, but performances are poor and the list doesn't scroll >>>> well. On >>>> iPad it's almost acceptable, but on Android I have to scroll row >>>> by row >>>> and wait until every image of the row is loaded. >>>> Any suggestions to improve the situation? >>>> Thanks >>>> >>>> Gabriele >>>> >>>> >
